Automatic machine-brake



(No Model.)

B. PITMAN. Automatic Machine Brake.

No. 234,426. Patented .Nov. 16,1880.

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EBEN PITMAN, OF PUTNAM, CONNECTICUT.

AUTOMATIC MACHINE-BRAKE.

SPECIFICATION forming part of Letters Patent No. 234,426, dated November 16, 1880.

Application filed September 14, 1880. (No model.)

To all whom it may concern:

Be it known that I, EBEN PITMAN, of Putnam, in the county of Windham and State of Connecticut, have invented certain new and useful Improvements in Automatic Machine- Brakes; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and.

use the same, reference being had to the accompanying drawings, which form a part of this specification.

Figure l. is a view, in perspective, of a sewin g-machine to which my improved automatic brake is applied. Fig. 2 is an end elevation of the same, and Fig. 3 is a detail view of the brake detached.

The invention has for its object the arresting of the momentum of the driving-wheel that operates the needlebar, shuttle, and feed of a sewing-machine or other similar machine driven by power at the instant the power is removed from the treadle, and without the necessity of removing the hands from the work in process by the pressure of a brake thereon, as will be hereinafter fully described, and particularly pointed out in the claim.

In the accompanying drawings similar letters of reference indicate corresponding parts in the several figures.

A designates the driving-wheel for operating the needle-bar, the shuttle, and the feed of a sewing-machine.

B designates the pulley on the main'shaft a, which said pulley is at rest when the machine is not in operation, and is connected by a belt, b, with the driving-wheel A.

designates the ordinary friction-clutch, and D the treadle connected therewith.

E designates a brake-shoe operated to press against the driving-wheel A by springs c a, suspended in hangers d (1, connected to the under side of the table of the machine, or arranged in any other convenient manner to operate the brake-shoe E, so that its normal position will be against the driving-wheel A. A rod, G, is pivoted or otherwise connected to the brake-shoe E at its upper end, and connected by a joint, 0, at its lower end to the treadle D.

By this construction, when pressure is applied to the treadle to start the machine the brake-shoe E will be withdrawn from contact with the driving-wheel A, and will be kept away from contact therewith as long as the pressure is continued on the treadle D but as soon as pressure is removed from the treadle the springs c 0 will automatically apply the brake and arrest the momentum of the driving-wheel A without the necessity of removing the hands from the work in process.

Slight modifications of the brake may be necessary to adjust it to machines of different constructions, but they will readily suggest themselves to the skilled mechanic and require no departure from the invention to apply them.

The device is simple and inexpensive and its advantages are obvious.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

In an automatic machine-brake, the combination of the driving-wheel A, the brake E, operated by the springs c c, the rod Gr, and the treadle D, fulcrumed in the rear of the pulley-shaft and connected to the same by the friction-clutch O, the pulley B, and band I), all constructed and operating substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two Witnesses.

EBEN PITMAN.

Witnesses:

P. J. OLEARY, Y SAMUEL H. SEWARD. 

